Cardiac rhythm management device with triggered diagnostic mode
First Claim
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1. A cardiac rhythm management device, comprising:
- a sensing channel for sensing ventricular electrogram signal and generating a ventricular sense (R wave) when the electrogram signal exceeds a specified threshold value;
circuitry for measuring and collecting time intervals between successive R waves and storing the collected intervals as a discrete RR interval signal;
bandpass filters for filtering the RR interval signal into defined high and low frequency bands;
a power detector for determining the signal power of the RR interval signal in each of the low and high frequency bands, referred to LF and HF, respectively; and
, circuitry for computing an LF/HF ratio and triggering a diagnostic mode if the LF/HF ratio exceeds a predetermined ratio threshold value, wherein upon entering the diagnostic mode, the device activates processing circuitry that performs data analysis to assess the probability of the occurrence of a pathological event.
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Abstract
A device and method in which spectral analysis of heart rate variability is performed in order to assess autonomic balance. When a threshold level is reached, a diagnostic mode is triggered in which the device performs computationally intensive data analysis to assess the probability of a pathological event such as an arrhythmia occurring.
91 Citations
20 Claims
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1. A cardiac rhythm management device, comprising:
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a sensing channel for sensing ventricular electrogram signal and generating a ventricular sense (R wave) when the electrogram signal exceeds a specified threshold value;
circuitry for measuring and collecting time intervals between successive R waves and storing the collected intervals as a discrete RR interval signal;
bandpass filters for filtering the RR interval signal into defined high and low frequency bands;
a power detector for determining the signal power of the RR interval signal in each of the low and high frequency bands, referred to LF and HF, respectively; and
,circuitry for computing an LF/HF ratio and triggering a diagnostic mode if the LF/HF ratio exceeds a predetermined ratio threshold value, wherein upon entering the diagnostic mode, the device activates processing circuitry that performs data analysis to assess the probability of the occurrence of a pathological event. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 15, 16, 17, 18, 19, 20)
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13. A method for operating a cardiac rhythm management device, comprising:
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sensing ventricular electrogram signals and generating a ventricular sense (R wave) when the electrogram signal exceeds a specified threshold value;
measuring and collecting time intervals between successive R waves and storing the collected intervals as a discrete RR interval signal;
filtering the RR interval signal into defined high and low frequency bands;
determining the signal power of the RR interval signal in each of the low and high frequency bands, referred to LF and HF, respectively; and
, computing an LF/HF ratio and triggering a diagnostic mode if the LF/HF ratio exceeds a predetermined ratio threshold value, wherein upon entering the diagnostic mode, the device activates processing circuitry that performs data analysis to assess the probability of the occurrence of a pathological event.
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Specification